<template>
    <div>
        <!-- 顶部滑动条区域 -->
        <div id="slider" class="mui-slider">
				<div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
					<div class="mui-scroll">
						<a :class="['mui-control-item',item.id === 0 ? 'mui-active' : '']" v-for="item in cates" :key='item.id' @click="getPhotoListByCategoryId(item.id)">
							{{ item.title }}
						</a>
					</div>
				</div>
        </div>
        <!-- 图片列表区域 --> 
        <ul class="photo-list">
            <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/' + item.id" tag="li">
                <img v-lazy="item.img_url">
                <div class="info">
                    <h1 class="info-title">{{item.title}}</h1>
                    <div class="info-body">{{item.zhaiyao}}</div>
                </div>
            </router-link>
        </ul>


        </div>
        
        

</template>

<script>
// 1.导入MUI的js文件
import mui from '../../lib/mui/js/mui.min.js'


export default {
    data(){
        return {
            cates:[], // 所有分类的列表数组
            list:[],  // 图片列表的数组
        };
    },
    mounted(){  // 生命周期
        // 当组件中的DOM结构被渲染并被放到页面中后，会执行这个钩子函数
        // 
        // 2.初始化滑动控件
        mui('.mui-scroll-wrapper').scroll({
            deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
        });
    },
    created(){
        this.getAllCategory();
        // 默认进入页面  就主动请求所有的图片列表的数据
        this.getPhotoListByCategoryId(0);
    },
    methods:{
        getAllCategory(){
            // 获取所有的图片分类
            this.$http.get('api/getimgcategory').then(result => {
                if(result.body.status === 0){
                    // 手动拼接一个最完整的分类列表
                    result.body.message.unshift({title:'全部',id:0});
                    this.cates = result.body.message;  
                }
            })
        },
        getPhotoListByCategoryId(cateId){
            // 根据分类id获取图片列表
            this.$http.get('api/getimages/'+ cateId).then(result => {
                if(result.body.status === 0) {
                    this.list = result.body.message;
                }
            })
        }
    }
}
</script>


<style lang="scss" scoped>
* {
    touch-action: pan-y;
}

.photo-list {
    list-style: none;
    margin: 0;
    padding: 10px;
    padding-bottom: 0;
    li {
        background-color: #ccc;
        text-align: center;
        margin-bottom: 6px;
        box-shadow: 0 0 9px #999;
        position: relative;
        img {
            width: 100%; 
            vertical-align: middle;
        }
        img[lazy=loading] {
            width: 40px;
            height: 300px;
            margin: auto;
        }
        .info {
            color: white;
            text-align: left;
            position: absolute;
            bottom: 0;
            background-color: rgba(0,0,0,0.3);
            max-height: 84px;
            .info-title {
                font-size: 14px;
            }
            .info-body {
                font-size: 12px;
            }
        }
    }
}
</style>
